Photo copying apparatus



W. SACK PHOTO COPYING APPARATUS ou. 16, lsza Filed June 30. 1925 2 Sheets-Sheet l m w U I. w im i m W mw mwm H n KH @KN H n H A m n l nu V H k., xv 1m QW inl, m1, H, w* W a n n m. o Www/MMVV/V NVV Kw /r M/ I f 4 n. Qn .a mvv MM N m. n N, R NN m m Q Oct. 16, 1928. 1,688,059

w. SACK PHoTo COPYING APPARATUS Filed June 50, 1925 2 sheets-sheet 2' Patented Oct. 16, 1928.

UNITED STATES WERNER-SACK, OF DUSSELDORF-BATH, GERMANY.

rnoro COPYING APPARATUS.

Application lcd June 30, 1925, Serial No. 40,632,-and in Germany June 26, 1924.

This invention relates to photo copying apparatus and .has for its objectV to provide an improved form of apparatus whereby more elieient copies are obtained.

An essential object of the invention is to provide means whereby a rubber cover and a transparent plate can be pressed together adjacent their edges so as to obtain a fluidtight joint adjacent said edges.

A further object of the invention is to effectively withdraw the lair from between the rubber cover and the transparent plate.

Another object of the invention is to provide means whereby two frames, in whichthe transparent plate and the rubber cover are respectively supported, can be separted from one another and brought towards one another.

Further objects of the invention will appear from the following description with ref- -erence to the accompanying dra-wings wherein- Figure 1V shows a longitudinal section through the middle of the photo copying apparatus.y

Figure 2 shows an'end elevation of the copying apparatus, partly in section, and

vFigure 3 shows a vertical section of a valve for use' in connection with the apparatu The photo copying apparatus consists of a rectangular Awood frame 1 which is adapted to support a seeondrectangular wood frame 2. To opposite sides of the frame 1 there are secured brackets 3, thesebrackets being adapted to lie along the central axis of the frame. Along this axis the brackets 3 arev provided with pivots 4 which are rotatably mounted in bearings 5"L and 5". These bearings are provided in supporting structures A Through suitable holes provided in the brackets 3 are-passed screw threaded spindles 9, 9b engaging with nutslO rotatably mounted in casings 13 provided on the brackets 3. The nuts 10 are each formed integral with a bevel wheel 11 engaging with bevel wheels 12 keyed to a shaft 14 rotatably mounted in the brackets 13. I

On the shaft 14 is also keyed a bevel wheel 16 gearing with a'bevel wheel 17 keyed to a v27'so as to form shaft 19 adapted to be rotated by means of a crank 18. The bevel wheels 1 6 and 17 are enclosed in a casing the supporting structure. Through the upper ends of the dles 9, 9* pass freely rotatable bolts 20a andv 20@` which are screwed into brackets 21L and 21b arranged at the middle of opposite sides of the frame 2. In this manner the frame 2 is rotatab y supported by the spindles' 9 and 9b.

` The spindle 9a is extended beyond the bolt 20"JL and is provided with an axial bore into which is fitted a sliding member 22 in which 'there is rotatably mounted a roller 23. The

roller 23 is urged outwardly by a spiral spring 24 disposed between the bottom of the bore and the sliding member 22. The bracket 21a is provided with an extension 25 having a semi-circular wall 26. The inner surface of the wall 26 is provided with projections notches for co-operation with the roller 23. By means of this arrangement the frame 2 which is rotatable on the bolts 20n and 20b can be locked in a horizontal or any suitable inclinedposition. The frame 2 can be tilted by simply gripping this by hand and moving it into the required position.

Into the frame 2 is itted a plate 28 of glass or other transparent material. This plate is provided with an opening 29 which may be closed by a valve body 30. The valve body 30 is rigidly connected to a rod 31 which can easily move up and down in a valve casing l To the frame 2 is secured a bracket 55 into which is screwed a hollow sleeve 56 adapted to press the lower edge of a bell-shaped member 57 into engagement with the bellshaped valve casing 32. The lower portion of the valve casing is lined with a double cupshaped rubber body 58, 59. When the screw sleeve 56 presses the body 55 downwards this in turn presses downwardly the body 32 'and this presses the edge of the body 58 into close contact with the glass plate 28. The position of the inner cup `59 1s such that the edge.' thereof will also be pressed against the glass 15 suitably secured to screw spinsired. The valve rod 31 is suspended by means of a chain 34 from a rod 35. When the apparatus is closed the rod 35 engages with they bracket 3 so that the valve body 30 is withdrawn' from the glass plate 28 as shown in Figure 1. The air contained underneath the glass plate can thus be withdrawn through the opening 29 int-o the pipe 33 as in this position the valve body 30 has also raised the cup 59 away from the glass plate. This lifting is possible, in spite of the fact that the buter cup 58 is pressed against. the glass plate, by

reason of the fac-t that the double cupped member isv of rubber and the upper connecting wall 61 between the two cup members permits of this movement. I-f however the frame 2 has been raised from the frame 1 the rod 35 is no longer supported by the bracket 3 and therefore moves downwardly. The valve body 30 suspended from the rod 35 partakes of this movement and will consequently come into engagement with the glass plate. The cup member 59 will now no longer be raised from the glass plate and consequentlyits lower edge, by reason of the elasticity of the rubber and the air pressure acting from the top on the wall 61, will be pressed tightly against the glass plate. Air can then no longer pass through the valve into the pipe 33.

Into each of theo four corners of the frame 1 are iitted sleeves 36 with which engage pins 37securedto an auxiliary frame 38. To this frame there is secured .in the known manner a rubber cover 39. In order that this will lie as flat as possible and in order that it may bear closely againstethefglass plate even before Withdrawal of air ytakes place, this rubber cover is supportedbv a plate 40 resting on spiral springs 41. These spiral springs are supported y plates 42 secured to the frame 1. v

The bearing 5a has secured thereto a disc 43 (Figures 1 and 2) and is'also provided with a cylindrical extension 44 in which is ,slidably mounted a. pin 45. A-spiral spring 46 fitted" into the cylindrical extension presses the pin 45 to the right and when the frame is in a horizontal position this pin is pressed against a bolt 47 slidably mounted ina' bore provided in the bracket 3. When the apparatus `is closed, that 1s to say when the glass plate 28 rests on the cover 39 or on the interposed drawings or the likem recessed portion v48 provided on thscrew spindle 9" 1s opposite the bolt 47. The depth of this recess and the length of the roller 47 are such that inthe posltloprshown in Figure 1, therefore when the apparatus is closed, the left hand end of the bolt 47 is flush with the left hand face of the bracket 3, that is to say does not project' therefrom. In this position the frame 1 can be tilted. If however the screw spindles 9 yand 9b have been raised, the recess 48, as shown in Figure 1, is no longer adjacent the bolt 47 and .the latter is therefore pressed to the left by the screw spindle 9a. The bolt will therefore partly engage with the bracket 3 and partly .with the cylindrical extension 44 thus preposition, as only in this position will the cylindrical extension 44 be opposite the bolt 47 and enable this to pass into the said extension Vhen the apparatus is closedthe frame 1 together with the frame 2 can be tilted about the pivots 4 in any suitable direction as then the centre of gravity of the frames coincides substantially with the axis of rotation of the pivots 4 so that the apparatus will not tip over. This tilting is necessary inorder to enable the surface of the apparatus to be exposed to be set in a position according to the direction of the sun. In order to secre the apparatus in any desired tilted position thev periphery of the disc 43 is provided with notches 49 (Figure 2) with whichengages a roller 5 0 rotatably mounted in a guide member 51. The member 51'can slide freelyv up and down in ahollow casting 52 of a plate 53 which serves as a cover for the casin'g 13. The spiral spring 54 presses the roller 50 constantly against the periphery of the notchefhdisc 43 or into the notches 49.

From the above description the manipulation of the apparatus will be readily understood. Assuming the apparatus is in the -position shown in Figure 1, By suitably turning the crank 18 the nuts 10 will be rotated and thus the screw spindles 9 and 9b together with the frame 2 will be raised.' The glass plate 28 is thus raised from the rubber cover 39 and the sensitized paper'or the like can be placed 'on this. )n the sensitized paper is then placed the drawing to be co ied. In order thatthis operation may be e ected more conveniently the frame 2 is tilted by tilting this `on the pivots 20n and u2O".

position by the engagement of the roller 23 between two adjacent projections 27. When the frame 2 is to'. be returned into its horizontal position then by applying pressure to the frame the roller 23 will be moved against the action of the spring 24 and will spring lThe frame is then -held in the required tilted over any projection until it engages with a recess corresponding with the horizontalposition of the frame. f

If the crank 18 is now turned in the opposite direction the screw s pindles 9a and 9" to` gether with the frame 2 will belowered until the glass plate 28 comes into contact with the rubber cover 39 or the material which has been placed thereon. During the last portion of this movement the rod 35 has come into contact with thebracket 3 thus lifting the .valve body 30 and the inner cup member 59 from the glass plate so that the air, which is still between the glass plate and the rubber cover, can be withdrawn through the opening 29 and the pipe 33; j

In ordcrf to tilt the apparatus, which is now closed, fully towards the sun, the vframe l is tilted in the desired direction and is secured in this position by the roller which by reason of the -action of the spring 54 engages with a corresponding recess 49 of the disc 43. y

The screw thread of the screw spindles 9n and 9b is single threaded. Consequently the lifting and lowering device is self-locking, that is to say that the frame 2 cannot be lowered from its raised position by its own weight or by any other additional load and it cannot be raised from its lowered position. rfhis arrangement hasthe advantage that separate locking means are not necessary and that the frame must retain the position imparted thereto by the rotation of the crank 18 until-it is moved into a fresh position by rotating the crank in one direction or the other.- The raised frame 2 therefore automatically remains in the raised position. and when it has been brought by the rotation of the crank 18 so that its glass plate bears tightly upon the rubber cover it retains this position. If this automatic locking means were not available separate locking means would beaiecessary and it would be necessary to operate such means so that the manipulation of the apparatus would not/be so simple.

In photo copying apparatus known hitherto the air is withdrawn'through an opening in the rubber cover. rIhe withdrawal of the air through an opening` in the glass plate has` the advantage that the formation of an airtightjoint with the valve `casing is simpler and. more effective than `when it is applied to the yielding rubber cover. In addition there is better accommodation for the valve casing on the glass plate than on they rubber cover supported by a plate. FurtherA the with` drawal of air through the pivot of the upper frame is more convenient and simpler. @i considerable importance is the automatic closing of the valve when the apparatus is open and the automatic opening of the valve when the apparatus cio-ses, the operation be-v ing simpler because the valve is provided at theton and the opening to be closed is underneath it. A

rIhe auxiliary frame 38 is desirable and ad- Levant-ageous for the following reasons. If

it is not provided then when the movement of the frame 2 from the frame 1 commences the glass plate is torn from the rubbercover 39 thus considerably damaging the latter. lVith the present arrangement however the auxiliary frame 38 first moves upwardly for a short distance with the frame 2 as the rubber cover still .adheres to the glass plate 28 and is secured to the frame 38. By reason of the weight of the rubber cover and the auxiliary fra1ne38 to which it is connected this adhesion of the rubber cover to the glass plate is somewhat loosened and consequently air entersibet'ween them which separates the rubber cover from the glass plate smoothly so that the'auxiliary lframe 38f'returns to the frame 1 whilst being guided by the pins 37.

By arranging the bell-shaped part 57 be` ltween the valve casing 32 and the screw sleeve 5G and lif necessary forming the contacting surfaces of the sleeve 56 with the part 57 and ofthe part 57 with the casing 32 of spherical shape it is possible to adjust the 1casing relatively to the axis of the sleeve 56 and thus cause thel edges of the double bell-shaped member 58, 59 to bear completely upon the glass plate even when the axis of the sleeve 5G is inclined to the glass plate. In this manner an eficient joint is obtained between the said edges and the glass plate. y

Having thus described my. invention what I claim as new and' desire to secure by Letters Patent is Y y 1. Photo copying apparatus comprising ya supporting structure, al frame mounted in .said supportingfstruoture, a rubber cover supported 1n said frame,

ai second framemounted in said'supporting structure, a transparent plate-fitted in said second frame, said transparent plate having an opening therein, means for moving said frames towards and afway from one another, said means serving to hold said frames when together and when separate, the edges of the rubber sheet being adapted theJ transparent plate so as to form an air tight oint between said rubber 'cover and said transparent plate,a valve casing with a valve seating fitted over said opening, said valve casing normally bearing on the transparent plate around .said hole whilst the valve seating is opposite said opening but slightly removed therefrom, a valve body co-operating with said seat and slidably mounted therein said valve body being adapted to close and expose said opening, and a suction tube con-C5 nected to said Valve casing, said valve casing being adapted to form an airtight joint with said transparent plate when the valve body` exposes said opening. 'i

to be pressed into close ContactA with 2. Photo copying apparatus comprisinga supporting structure, a frame mounted 1n said supporting structure, a rubber cover supported in said frame, a second frame 'contact with the transparent plate so as to form an) air tight joint between said rubber cover and said transparent plate, a valve casing with a valve seating fitted over s aid opening, said valve casing normally bearing on the transparent plate around said holewhilst the. valve seating is opposite said opening but slightly removed therefronna valve body cooperating with said seat and slidably mounted therein said valve body being adapted to close and expose said opening, a suction tube connected to said valve easing, said valve casing being adapted to forni an air-tight joint with said transparent plate when the valve body exposes said opening, and actuating mechanism for said valve body, the arrangement being such that when the said frames are moved towards one another the valve body exposes said opening whilst when the said frames are separated from one another said valve body closes said opening.

3. Photo copying apparatus comprising a supporting structure, a frame mounted in said supporting structure, a rubber cover supported in said frame, a second frame mounted in said supporting structure, a transparent plate fitted in said second frame, said transparent plate having an openingtferein, means for moving said frames towards and away from one another, said meansserving to hold said frames when together and when separate, the edges of the rubber sheet-being adapted to be pressed into close` contact withv `the transparent plate so as to form an airtight joint between said rubber cover and said transparent plate, a yalve fitted over said opening, a suction tube connected to said valve, and pivots secured to said second frame and revolubly mounted in said supporting structure, one of said pivots being hollow,l

said suction tube passing through said hollow pivot.

.4. Photo copying apparatus comprising a supporting structure, two frames mounted in said supporting structure, a rubber cover securedto one .of said frames, a glass plate litt/ed into the second frame, said glass plate.

a having an opening therein, screw spindles non-rotatably engaging one of said frames,

whilst the second frame is attached to said screw spindles, nuts through which said screw spindles pass, mechanism for Irotating said nuts, whereby on the rotation of the nuts the spindles are simultaneously lowered in order to press the edges of the rubber cover into close contact with the glass plate adjacent the edgesthereof so. as to form an air-tight joint at all points of contact, and to raise the spindles, according to the direction of rotation of the nuts, and means connected to said opening adapted to withdraw the air through said opening from between the glass plate and the rubber cover.

5. Photo copying apparatus comprising a supporting structure7 two frames mounted in said supporting structure, arubber cover secured to one of said frames, a glass plate fitted .into the second frame, said glass plate having an opening therein, single threaded screw spindles non-iotatably engaging one of said frames, pivots secured to the second frame, said pivots being revolubly mounted in said spindles, nuts rotatably mounted anden gaged by said screw spindles, and mechanism for rotating said nuts simultaneously whereby on the rotation of the nuts in one direction the `'spindles are moved downwardly so as to lower t-he second frame upon the first frame in order to press the rubber cover against the glass plate into close contact with the glass .plate adjacent the edges thereof at all points of contactsimultaneously, and when the nuts are rotated in the opposite direction to raise the second frame from the first frame, the engagement bet/Ween the spindles and nuts serving to retain them in their relative positions, and means connected to said opening adapted to withdraw the air through said opening from bet-Ween the rubber cover and the glass plate. l

6. Photo copying apparatus comprising a supporting structure, two frames mounted in said supporting structure, a rubber cover secured to one of said frames, a glass plate fitted into the second frame, said lglassf plate having an opening therein, screw spindles nonrotatably engaging one of said-frames, whilstv the second frame is attached to said screw spindles', nuts through which said screw spindles pass, mechanism for rotating said nuts, whereby on the rotation of t-he nuts the spindles are simultaneously lowered in order to press the edges of the rubber lcover into close contact with the glass plate adjacent the edges thereof so as to form an air-tight joint at all points of Contact, and to raise the spindles, accordingto the direction of rotation of the nuts, means connected to said opening adapted towithdraw the air through said opening Connected `to said second actuated member being with said notches.

7 Photo copying apparatus comprising a support-ing structure, two frames mounted 1n said supporting structure, a rubber cover secured to one of said frames, a glass -plate litted into the second frame, said glass plate having an opening therein, screw spindles non-rotatably engaging one of said frames, whilst the second frame is attached to said screw spindles, nuts through which said screw spindles pass, mechanism for rotating said nuts, whereby on the/rotation of the nuts the spindles are simultaneously lowcred'in order to lpress the edges ofthe rubber cover in to close contact with the glass plate adjacent the edges thereof so as to form an air-tight joint at all points of contact, and to raise the spindles, according to the diretion of rotation of the nuts, means connected to said opening adapted to withdraw the air through said opening from between the glass plate and the rubber cover, a dise with a notched peripherysecured to said supporting` structure, and a spring actuated roller carried by one of the frames and adapted to co-operate with the notches in the disc for the purpose of retaining the frame in various inclined positions. j

8. Photo copying apparatus comprising a supporting structure, two frames mounted in said supporting structure, a rubber cover secured to one ot' said frames, a glass plate fitted into the second frame, said glass plate having an opening therein, screw spindles non-rotatably engaging one of said` frames, whilst the second frame is attached to said screw spindies, nuts through which said screw spindles pass, mechanism for rotating said nuts, whereby on the rotation of the nuts the spinframe, the spring adapted to engage dles are simultaneously lowered in order to press the edges of the rubber cover into close contact with the glass plate adjacent the edges thereof so as to form an air-tight joint yat all points of contact, and to raise the spindles, according to the irection of rotation of the nuts, means connected to said opening adapted to `withdraw the air through said opening from between the glass plate and the rubber cover, an apertured disc carried by the supporting structure, a bolt slidably mounted in one of said frames, one of said screw spindles having a recess therein for coopI eration with said bolt, a spring actuated locking pin being adapted to co-operate with said bolt, said locking pin being adapted normally to press the said bolt into engagement with the recessto permit of rotation of the frames, the arrangement being such that when the bolt is out of engagement with the recess it locks'the frame to the disc and thus prevents' the frame frombeing tilted( n 9., Photo copying apparatuscompmsmga supporting structure, a frame mounted in said supporting structure, a rubber cover supported in said frame, a second frame mounted in said supporting structure, a transparent plate fitted in said second frame, said transparent plate having an opening therein,

means for moving said frames towards and away from one another, said means serving to hold said frames when together and when separate, the edges of the ru ber sheet being adapted to be pressed into close contact with ythe transparent plate so as to form an airtight joint between said rubber cover and said transparent plate, a valve fitted over said opening, a suction tube connected to said valve, and mechanisme for actuating said valve, said mechanism being such that it closes the valve after one ot' the frames has been raised a short distance and opens the valve to suction when the frames are brought together.

r l0. Photo copying apparatus comprising a supporting structure, a frame mounted in said supporting structure, a rubber cover supported in said frame, a second frame mounted in said supporting structure, a transparent plate fitted in said second frame, said transparent plate having an opening therein,

means for moving said away from one another, to hold said frames when separate, the edges of the rubber sheet being adapted to be pressed into close contact with the transparent plate so as to form an airtight joint between said rubber cover and said transparent p ate, means connected to said opening, adapted kto withdraw the air through said opening from between the Arubber cover and the transparent plate, a supporting plate arranged underneath the first frame and adapted` to support the' rubber cover, and resilient supporting membersA on which said supporting plate is mounted.

1l. Photo copying apparatus comprising a supporting structure, a iframe Amounted in said supporting structure, a rubber cover supported in said frame, a second frame mounted in said supporting structure, a transparent plate fitted in said second frame, said transparent plate having an opening therein, means for moving said frames towards and away from one another,.said means serving to hold said frames when together and when separate, the edges of the rubber sheet being adapted to be pressed into close contact with the transparent plate so as to form an airtight joint betweensaid rubber cover and said transparent plate, means connectedeto said opening, adapted to withdraw the air through said opening .from between the rubber cover and the transparentplate, and an auxiliary frame mounted in the first frame, said auxiliary frame having the rubber cover attached thereto. v

12. Photo copying apparatus comprising a supporting structure, a frame mounted in said supporting structure, arubber cover Supframes towards and said means serving together and when ported in said frame, a second frameounted in said supporting structure, a transparent plate fitted in said second frame, said transf parent plate having an opening therein,L means for moving said frames towards andVl away from one another, said means serving to hold said iranes when together and when separate, the edges of the rubber sheet being adapted to be pressed into close Contact with, the transparent plate so as to form an airtight joint between said rubber cover and said transparent plate, means connected to said opening, adapted to withdraw the air through sai/d opening from between the rubber cover and the transparent plate, and an auxiliary rame'mounted in the first mentioned frame,

and means for guiding the auxiliary frame WERNER SACK. 

